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Liquid Crystal Polyester Porous Film

Inactive Publication Date: 2012-06-28
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0006]However, since the porous membrane of the polysulfone does not necessarily have sufficient acid resistance, it is unsuited for filtration of an acidic fluid, and use of an acid is limited at the time of washing. Thus, an object of the present invention is to provide a porous membrane having excellent heat resistance and acid resistance.
[0008]The porous membrane of the present invention has excellent heat resistance and acid resistance.

Problems solved by technology

However, since the porous membrane of the polysulfone does not necessarily have sufficient acid resistance, it is unsuited for filtration of an acidic fluid, and use of an acid is limited at the time of washing.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

production example 1

Production of Liquid Crystal Polyester (1)

[0049]In a reactor equipped with a stirrer, a torque meter, a nitrogen gas introducing tube, a thermometer and a reflux condenser, 941 g (5.0 mol) of 6-hydroxy-2-naphthoic acid, 415.3 g (2.5 mol) of isophthalic acid, 273 g (2.5 mol) of 4-aminophenol and 1,123 g (11 mol) of acetic anhydride were charged. After replacing a gas in the reactor by a nitrogen gas, the temperature was raised from room temperature to 150° C. over 15 minutes while stirring under a nitrogen gas flow and the mixture was refluxed at 150° C. for 3 hours. While distilling off by-produced acetic acid and the unreacted acetic anhydride, the temperature was raised from 150° C. to 320° C. over 2 hours and 50 minutes, followed by maintaining at 320° C. At the point of time when an increase in torque was recognized, contents were taken out from the reactor and then cooled to room temperature. The obtained solid was crushed by a crusher, subjected to solid phase polymerization b...

production example 2

Production of Liquid Crystal Polyester (2)

[0050]In the same operation as in Production Example 1, except that the temperature of the solid phase polymerization was changed from 250° C. to 240° C., a powdered liquid crystal polyester (2) was obtained. The obtained liquid crystal polyester (2) showed a reduced viscosity of 0.34 g / dL.

production example 3

Production of Polysulfone (1)

[0051]In a reactor equipped with a stirrer, a nitrogen gas introducing tube, a thermometer and a reflux condenser, 589 g of bis(4-chlorophenyl)sulfone, 500 g of bis(4-hydroxyphenyl)sulfone and 942 g of diphenylsulfone (solvent) were charged, and the temperature was raised from room temperature to 180° C. while stirring under a nitrogen gas flow. Then, 287 g of potassium carbonate was added. While distilled off by-produced water, the temperature was gradually raised from 180° C. to 290° C. After maintaining at 290° C. for 2 hours, contents were taken out from the reactor and then cooled to room temperature. The obtained solid was crushed by a crusher, washed with warm water and washed with a mixed solvent of acetone and methanol several times, and then dried with heating at 150° C. to obtain a chloro group-terminated powdered polysulfone (1). The obtained polysulfone (1) showed a reduced viscosity of 0.52 dL / g.

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Abstract

An object of the present invention is to provide a porous membrane having excellent heat resistance and acid resistance. A porous membrane is constituted by a liquid crystal polyester and a polymer other than the liquid crystal polyester. A liquid crystal polyester having a reduced viscosity of 0.40 dL / g or more is used as the liquid crystal polyester. A polymer having a reduced viscosity of 0.40 dL / g or more is used as the polymer other than the liquid crystal polyester. The content of the polymer other than the liquid crystal polyester is adjusted from 10 to 40 parts by mass based on 100 parts by mass of the liquid crystal polyester.

Description

BACKGROUND OF THE INVENTION[0001](1) Field of the Invention[0002]The present invention relates to a porous membrane obtained by using a liquid crystal polyester.[0003](2) Description of Related Art[0004]A porous membrane of a polymer is used as a membrane filter in various fields such as water treatment field (e.g., production of drinking water, water treatment or waste water treatment), food industry field and medical field. For example, in the water treatment field, filtration of a polymer with a porous membrane has recently been carried out so as to remove impurities in water in place of conventional sand filtration and coagulative precipitation treatments. In the food industry field, a porous membrane of a polymer is used as a membrane filter for separation and removal of yeast used in fermentation, and concentration of a liquid. In the medical field, a porous membrane of a polymer is used as a membrane filter for artificial dialysis.[0005]As described above, heat resistance is ...

Claims

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Application Information

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IPC IPC(8): D02G3/00C09K19/38C09K19/54
CPCB01D61/145B01D69/08Y10T428/2913C09K19/3809B01D71/48B01D71/481
Inventor KOHINATA, YUSAKU
Owner SUMITOMO CHEM CO LTD
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